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Method for solving false action of differential protection when power transfer of transformer

A differential protection and power transfer technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as failure to find the cause and treatment method, malfunction of transformer differential protection, etc., to increase and reduce unstable factors. Effect

Active Publication Date: 2013-03-27
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Similar to the above-mentioned example in the operating substation, the problem of misoperation of transformer differential protection during power transfer has not been found for a long time. The cause of the fault and the treatment method

Method used

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  • Method for solving false action of differential protection when power transfer of transformer
  • Method for solving false action of differential protection when power transfer of transformer
  • Method for solving false action of differential protection when power transfer of transformer

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Embodiment (taking the main transformation of Huangdao Power Plant as an example)

[0022] The present invention analyzes the example of solving the misoperation and tripping of transformer differential protection during power transfer, and demonstrates the detection method for finding faults, determining the cause of misoperation of transformer differential protection during power transfer, and establishing a reasonable index system work done on.

[0023] When Huangdao Power Plant used the circuit breaker on the high voltage side of the main transformer to perform parallel operation with the system, a major accident occurred in which the differential protection of two transformers operated and the circuit breaker tripped, resulting in a large-scale power outage of the equipment. The fault not only cut off the equipment, The normal power generat...

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Abstract

The invention provides a method for solving false action of differential protection when power transfer of a transformer, comprising the following three steps: firstly, adopting a criterion of self-adaptively improving a definite value functionally, wherein an action value is set according to 1.2 times of rated value In; secondly, adding a time delay link of hiding unbalanced current in a low-current action region logically, wherein the setting time is 10ms; and thirdly, adding three times of harmonic blocking function characteristically, wherein the coefficient of braking is 0.1. The problem that false action of differential protection is carried out when power transfer of the transformer can be solved as long as the three steps play a role together. Computational results show that the original characteristics of differential protection are not influenced after the steps are adopted, and the problem of false action under special conditions is solved thoroughly. Therefore, the faults of power unit trip, large area equipment power failure and the like caused by differential protection are prevented, and the method plays an important role for ensuring normal running of electric fence.

Description

technical field [0001] The invention relates to a method for solving misoperation of transformer differential protection during power transfer, and belongs to the technical field of power system substation protection. Background technique [0002] In recent years, Huangdao Power Plant, Liyan Power Plant, and 220kV Dongcheng Substation have experienced several major accidents in which transformer differential protection, busbar differential action, and switch tripping caused large-scale power outages. The occurrence of the fault not only cut off the related equipment , also affects the stable operation of the power grid. [0003] For example, when Huangdao Power Plant used the circuit breaker on the high-voltage side of the main transformer to perform parallel operation with the system, a major accident occurred in which the differential protection of two transformers operated and the circuit breaker tripped, resulting in a large-scale power outage of the equipment. The occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
Inventor 苏文博孙健王大鹏李磊张国辉井雨刚吕强孙运涛
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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